AI 中文总结
该研究利用ARPES与第一性原理计算，分离PtBi$_2$(0001)两种表面终止面的体态与表面态，指认表面态并分析轨道组成，为其表面电子结构提供了一致图景。
AI 中文摘要
近期关于三方晶系PtBi$_2$中表面局域拓扑超导的报道，凸显了理解其表面电子结构的重要性。我们采用角分辨光电子能谱（ARPES）与第一性原理计算，研究PtBi$_2$的体态与表面能带结构。通过依赖光子能量和偏振的测量，我们在PtBi$_2$(0001)的两种不同表面终止面上，将体态色散与表面态分离开来；对两种终止面，我们均指认了若干不同的表面态，且发现实验与计算结果吻合良好。基于计算，我们分析了表面与体带中的轨道组成，并将结果与依赖偏振的ARPES测量进行对比。综上，我们的结果为PtBi$_2$在两种表面终止面上的表面电子结构提供了一致的图景。
英文摘要
Recent reports of surface-localized topological superconductivity in trigonal PtBi$_2$ highlight the importance of understanding its surface electronic structure. We investigate the bulk and surface band structure of PtBi$_2$ using angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations. Through photon-energy- and polarization-dependent measurements, we disentangle bulk dispersions from surface states on the two distinct surface terminations of PtBi$_2$(0001). For both terminations, we assign several different surface states and find good agreement between experiment and calculations. Based on our calculations, we analyze the orbital composition in the surface and bulk bands and compare the results to polarization-dependent ARPES measurements. Together, our results provide a coherent picture of the surface electronic structure of PtBi$_2$ across both surface terminations.
